SuperNova Early Warning System

Short description: Network of neutrino detectors for alerting astronomers to nearby supernovae

The SuperNova Early Warning System (SNEWS) is a network of neutrino detectors designed to give early warning to astronomers in the event of a supernova in the Milky Way, our home galaxy, or in a nearby galaxy such as the Large Magellanic Cloud or the Canis Major Dwarf Galaxy.

As of November 2020[update], SNEWS has not issued any supernova alerts. This is unsurprising, as supernovae appear to be rare: the most recent known supernova remnant in the Milky Way was around the turn of the 20th century, and the most recent Milky Way supernova confirmed to have been observed was Kepler's Supernova in 1604.

Powerful bursts of electron neutrinos (νe) with typical energies of the order of 10 MeV and duration of the order of 10 seconds are produced in the core of a red giant star as it collapses on itself via the "neutronization" reaction, i.e. fusion of protons and electrons into neutrons and neutrinos: p + e− → n + νe. It is expected that the neutrinos are emitted well before the light from the supernova peaks, so in principle neutrino detectors could give warning to astronomers that a supernova has occurred and may soon be visible. The neutrino pulse from supernova 1987A arrived 3 hours before the associated photons – but SNEWS was not yet active and it was not recognised as a supernova event until after the photons arrived.

Directional precision of approximately 5° is expected.[1] SNEWS is not able to give warning of a type Ia supernova, as they are not expected to produce significant numbers of neutrinos. Type Ia supernovae, caused by a runaway nuclear fusion reaction in a white dwarf star, are thought to account for roughly one-third of all supernovae.[2]

There are currently seven neutrino detector members of SNEWS: Borexino, Daya Bay, KamLAND, HALO, IceCube, LVD, and Super-Kamiokande.[3] SNEWS began operation prior to 2004, with three members (Super-Kamiokande, LVD, and SNO). The Sudbury Neutrino Observatory is no longer active as it is being upgraded to its successor program SNO+.

The detectors send reports of a possible supernova to a computer at Brookhaven National Laboratory to identify a supernova. If the SNEWS computer identifies signals from two detectors within 10 seconds, the computer will send a supernova alert to observatories around the world to study the supernova.[4] The SNEWS mailing list is open-subscription, and the general public is allowed to sign up; however, the SNEWS collaboration encourages amateur astronomers to instead use Sky and Telescope magazine's AstroAlert service, which is linked to SNEWS.

## See also

* Near-Earth supernova
* History of supernova observation
* Timeline of white dwarfs, neutron stars, and supernovae
* Supernova nucleosynthesis
* Supernova neutrinos

## References

1. ↑ Murphy, A. St. J. (2000). "SNEWS: The Supernova Early Warning System". Journal of the American Association of Variable Star Observers 29 (1): 31. Bibcode: 2000JAVSO..29...31M. http://adsabs.harvard.edu/full/2000JAVSO..29...31M. Retrieved 2020-11-16.
2. ↑ Adams, Scott; et, al (2013). "Observing the Next Galactic Supernova". Astrophysical Journal 778 (2): 164. doi:10.1088/0004-637X/778/2/164. Bibcode: 2013ApJ...778..164A.
3. ↑ "SNEWS". Brookhaven National Laboratory. 2015. http://snews.bnl.gov/news.html.
4. ↑ Jayawardhana, Ray (2013). "Physicists Eagerly Await Neutrinos from the Next Nearby Supernova [Excerpt]". Scientific American 309 (6): 68–73. doi:10.1038/scientificamerican1213-68. PMID 24383367.

## External links

* Antonioli, P. (2004). "SNEWS: the SuperNova Early Warning System". New Journal of Physics 6: 114. doi:10.1088/1367-2630/6/1/114. Bibcode: 2004NJPh....6..114A.
* Francis Reddy, "Time for SNEWS", Astronomy 3 June 2005
* NOVA podcast about SNEWS (the same in MP3 format)
* Weeks, Erin (22 January 2014). "Supernova Explosion in M82: Exciting, but No Neutrinos". http://sites.duke.edu/dukeresearch/2014/01/22/supernova-explosion-in-m82-exciting-but-no-neutrinos/.

* v
* t
* e

Neutrino detectors, experiments, and facilities

Discoveries|

* Cowan–Reines (νe)
* Lederman–Schwartz–Steinberger (νμ)
* DONUT (ντ)
* Neutrino oscillation
* SN 1987 neutrino burst

Operating
(divided by
primary
neutrino
source)|

| Astronomical|

* ANITA
* ANTARES
* BDUNT
* Borexino
* BUST
* HALO
* IceCube
* LVD
* NEVOD
* SAGE
* Super-Kamiokande
* SNEWS

|

Reactor|

* Daya Bay
* Double Chooz
* KamLAND
* RENO
* STEREO

Accelerator|

* ICARUS (Fermilab)
* MicroBooNE
* MINERνA
* MiniBooNE
* NA61/SHINE
* NOνA
* NuMI
* T2K
* COHERENT

0νββ|

* AMoRE
* COBRA
* CUORE
* EXO
* GERDA
* KamLAND-Zen
* MAJORANA
* NEXT
* PandaX
* XMASS

Other|

* KATRIN
* WITCH

Construction|

* ANNIE
* ARA
* ARIANNA
* BEST
* DUNE
* JUNO
* KM3NeT
* SNO+
* SuperNEMO

Retired|

* AMANDA
* CDHS
* Chooz
* CNGS
* Cuoricino
* DONUT
* ERPM
* GALLEX
* Gargamelle
* GNO
* Heidelberg-Moscow
* Homestake
* ICARUS
* IGEX
* IMB
* K2K
* Kamiokande
* KARMEN
* KGF
* LSND
* MACRO
* MINOS
* MINOS+
* NARC
* NEMO
* OPERA
* RICE
* SciBooNE
* SNO
* Soudan 2
* Utah

Proposed|

* CUPID
* GRAND
* Hyper-Kamiokande
* INO
* LAGUNA
* LEGEND
* LENA
* Neutrino Factory
* nEXO
* Nucifer
* SBND
* UNO
* JEM-EUSO
* WATCHMAN

Cancelled|

* DUMAND Project
* Long Baseline Neutrino Experiment
* NEMO Project
* NESTOR Project
* SOX
* BOREX

See also|

* BNO
* Kamioka Observatory
* LNGS
* SNOLAB
* List of neutrino experiments

* v
* t
* e

Supernovae

Classes|

* Type Ia
* Type Ib and Ic
* Type II (IIP, IIL, IIn, and IIb)
* Hypernova
* Superluminous
* Pair-instability

Physics of|

* Calcium-rich
* Carbon detonation
* Foe
* Near-Earth
* Phillips relationship
* Nucleosynthesis
* P-process
* R-process
* Neutrinos

Related|

* Imposter
* pulsational pair-instability
* Failed
* Gamma-ray burst
* Kilonova
* Luminous red nova
* Nova
* Pulsar kick
* Quark-nova
* Symbiotic nova

Progenitors|

* Hypergiant
* yellow
* Luminous blue variable
* Supergiant
* blue
* red
* yellow
* White dwarf
* related links
* Wolf–Rayet star

Remnants|

* Supernova remnant
* Pulsar wind nebula
* Neutron star
* pulsar
* magnetar
* related links
* Stellar black hole
* related links
* Compact star
* quark star
* exotic star
* Zombie star
* Local Bubble
* Superbubble
* Orion–Eridanus

Discovery|

* Guest star
* History of supernova observation
* Timeline of white dwarfs, neutron stars, and supernovae

Lists|

* Candidates
* Notable
* Massive stars
* Most distant
* Remnants
* In fiction

Notable|

* Barnard's Loop
* Cassiopeia A
* Crab
* Crab Nebula
* iPTF14hls
* Tycho's
* Kepler's
* SN 1987A
* SN 185
* SN 1006
* SN 2003fg
* Remnant G1.9+0.3
* SN 2007bi
* SN 2011fe
* SN 2014J
* SN Refsdal
* Vela Remnant

Research|

* ASAS-SN
* Calán/Tololo Survey
* High-Z Supernova Search Team
* Katzman Automatic Imaging Telescope
* Monte Agliale Supernovae and Asteroid Survey
* Nearby Supernova Factory
* Sloan Supernova Survey
* Supernova/Acceleration Probe
* Supernova Cosmology Project
* SuperNova Early Warning System
* Supernova Legacy Survey
* Texas Supernova Search

* Book:Supernovae
* Category:Supernovae
* Commons:Supernovae

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